Liability of State for witness fees in criminal cases when defendant not liable

In a criminal action, if no prosecuting witness is designated by the court as liable for the costs, and the defendant is acquitted, or convicted and unable to pay, or a nolle prosequi is entered, or judgment is arrested, or probable cause is not found, or the grand jury fails to return a true bill, the State shall be liable for the witness fees allowed per G.S. 7A-314 and any expenses for blood tests and comparisons incurred per G.S. 8-50.1(a).